nand backup

im pretty sure i already know the asnwer to this i just want to make sure

i have bootmii installed as a ios(when i try to launch it from hbc it just gives me a black screen reinstall perhaps 4.2u) i have priiloader installed works good boots up to it if i hold the reset and power buttons

my question is do i really need a nand back up if bootmii is install as ios?

even if i make a mistake and install a bad wad i should be able to load into priiloader and load hbc from there and uninstall the wad